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		<div style="display:none;" id="Q1">
			<div class="question1">
				<p>1. (单选题, 4.0 分)In Java, a class can directly inherit from only one parent class, this type of inheritance is called:</p>

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				<input type="hidden" value="A" name="answer1" />
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				<input type="radio" id="optionA" name="cQ0" value="A" />
				<label for="optionA">A.
					<pre><h2 style="font-size:20px">
		Single Inheritance
					</h2></pre>
				</label>
				
				<input type="radio" id="optionB" name="cQ0" value="B" />
				<label for="optionB">B.
					<pre><h2 style="font-size:20px">
		Multiple Inheritance 
					</h2></pre>
				</label>
				
				<input type="radio" id="optionC" name="cQ0" value="C" />
				<label for="option1C">C.
					<pre><h2 style="font-size:20px">
	    Interface Inheritance
					</h2></pre>
				</label>
				
				<input type="radio" id="optionD" name="cQ0" value="D" />
				<label for="optionD">D.
					<pre><h2 style="font-size:20px">
		Abstract Inheritance
					</h2></pre>
				</label>
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		<div style="display:none;" id="Q2">
			<div class="question2">
				<p>2. (单选题, 4.0 分)The advantage of single inheritance is: </p>

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				<input type="radio" id="option2A" name="cQ1" value="A" />
				<label for="option2A">A.
					<pre><h2 style="font-size:20px">
		Reducing the coupling between classes
					</h2></pre>
				</label>
				
				<input type="radio" id="option2B" name="cQ1" value="B" />
				<label for="option2B">B.
					<pre><h2 style="font-size:20px">
		Increasing code complexity
					</h2></pre>
				</label>
				
				<input type="radio" id="option2C" name="cQ1" value="C">
				<label for="option2C">C.
					<pre><h2 style="font-size:20px">
	    Enhancing code maintainability				
					</h2></pre>
				</label>
				
				<input type="radio" id="option2D" name="cQ1" value="D">
				<label for="option2D">D.
					<pre><h2 style="font-size:20px">
		Limiting class flexibility	
					</h2></pre>
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		<div style="display:none;" id="Q3">
			<div class="question3">
				<p>3. (单选题, 4.0 分)In single inheritance, a class can also act as:</p>


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				<input type="radio" id="option3A" name="cQ2" value="A" />
				<label for="option3A">A.
					<pre><h2 style="font-size:20px">
		Subclass and Interface
					</h2></pre>
				</label>
				
				<input type="radio" id="option3B" name="cQ2" value="B" />
				<label for="option3B">B.
					<pre><h2 style="font-size:20px">
		Superclass and Interface 
					</h2></pre>
				</label>
				
				<input type="radio" id="option3C" name="cQ2" value="C">
				<label for="option3C">C.
					<pre><h2 style="font-size:20px">
		Interface and Abstract Class 
					</h2></pre>
				</label>
				
				<input type="radio" id="option3D" name="cQ2" value="D">
				<label for="option3D">D.
					<pre><h2 style="font-size:20px">
		Abstract Class and Regular Class
					</h2></pre>
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		<div style="display:none;" id="Q4">
			<div class="question4">
            <p> 4.(单选题, 4.0 分)Why does Java adopt the single inheritance model?</p>		
		
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				<input type="radio" id="option4A" name="cQ3" value="A" />
				<label for="option4A">A.
					<pre><h2 style="font-size:20px">
		To reduce the dependencies between classes 
					</h2></pre>
				</label>
				
				<input type="radio" id="option4B" name="cQ3" value="B" />
				<label for="option4B">B.
					<pre><h2 style="font-size:20px">
		To increase code complexity
					</h2></pre>
				</label>
				
				<input type="radio" id="option4C" name="cQ3" value="C">
				<label for="option4C">C.
					<pre><h2 style="font-size:20px">
		To increase code flexibility
					</h2></pre>
				</label>
				
				<input type="radio" id="option4D" name="cQ3" value="D">
				<label for="option4D">D.
					<pre><h2 style="font-size:20px">
		To facilitate class reusability
					</h2></pre>
				</label>
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		<div style="display:none;" id="Q5">
			<div class="question5">
				<p>5. (单选题, 4.0 分)In the single inheritance model, a subclass inherits the: </p>


			
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				<input type="radio" id="option5A" name="cQ4" value="A" />
				<label for="option5A">A.
					<pre><h2 style="font-size:20px">
		 Public properties and methods                      
					</h2></pre>
				</label>
				
				<input type="radio" id="option5B" name="cQ4" value="B" />
				<label for="option5B">B.
					<pre><h2 style="font-size:20px">
	    Private properties and methods 
					</h2></pre>
				</label>
				
				<input type="radio" id="option5C" name="cQ4" value="C">
				<label for="option5C">C.
					<pre><h2 style="font-size:20px">
		Static properties and methods
					</h2></pre>
				</label>
				
				<input type="radio" id="option5D" name="cQ4" value="D">
				<label for="option5D">D.
					<pre><h2 style="font-size:20px">
		All properties and methods
					</h2></pre>
				</label>
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		<div style="display:none;" id="Q6">
			<div class="question6">
				<p>6. (单选题, 4.0 分)How can we describe the relationship between a superclass and subclass in the single inheritance model?</p>
			
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				<input type="hidden" value="A" name="answer6" />
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				<input type="radio" id="option6A" name="cQ5" value="A" />
				<label for="option6A">A.
					<pre><h2 style="font-size:20px">
		 is-a relationship
					</h2></pre>
				</label>
				
				<input type="radio" id="option6B" name="cQ5" value="B" />
				<label for="option6B">B.
					<pre><h2 style="font-size:20px">
	    has-a relationship
					</h2></pre>
				</label>
				
				<input type="radio" id="option6C" name="cQ5" value="C">
				<label for="option6C">C.
					<pre><h2 style="font-size:20px">
	    use-a relationship
					</h2></pre>
				</label>
				
				<input type="radio" id="option6D" name="cQ5" value="D">
				<label for="option6D">D.
					<pre><h2 style="font-size:20px">
		like-a relationship
					</h2></pre>
				</label>
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		<div style="display:none;" id="Q7">
			<div class="question7">
				<p>7. (单选题, 4.0 分)The disadvantage of single inheritance is:</p>

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				<input type="radio" id="option7A" name="cQ6" value="A" />
				<label for="option7A">A.
					<pre><h2 style="font-size:20px">
		It may lead to code complexity
					</h2></pre>
				</label>
				
				<input type="radio" id="option7B" name="cQ6" value="B" />
				<label for="option7B">B.
					<pre><h2 style="font-size:20px">
	    It reduces class extensibility  
					</h2></pre>
				</label>
				
				<input type="radio" id="option7C" name="cQ6" value="C">
				<label for="option7C">C.
					<pre><h2 style="font-size:20px">
		It limits class reusability
					</h2></pre>
				</label>
				
				<input type="radio" id="option7D" name="cQ6" value="D">
				<label for="option7D">D.
					<pre><h2 style="font-size:20px">
		It decreases code readability
					</h2></pre>
				</label>
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		<div style="display:none;" id="Q8">
			<div class="question8">
				<p>8. (单选题, 4.0 分)In the single inheritance model, a subclass can override the superclass's:  </p>

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				<input type="hidden" value="A" name="answer8" />
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				<input type="radio" id="option8A" name="cQ7" value="A" />
				<label for="option8A">A.
					<pre><h2 style="font-size:20px">
		Public methods
					</h2></pre>
				</label>
				
				<input type="radio" id="option8B" name="cQ7" value="B" />
				<label for="option8B">B.
					<pre><h2 style="font-size:20px">
		Private methods
					</h2></pre>
				</label>
				
				<input type="radio" id="option8C" name="cQ7" value="C">
				<label for="option8C">C.
					<pre><h2 style="font-size:20px">
		 Static methods
					</h2></pre>
				</label>
				
				<input type="radio" id="option8D" name="cQ7" value="D">
				<label for="option8D">D.
					<pre><h2 style="font-size:20px">
		Final methods
					</h2></pre>
				</label>
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		<div style="display:none;" id="Q9">
			<div class="question9">
				<p>9.(单选题, 4.0 分)In the single inheritance model, what is the maximum length the inheritance chain can have?</p>


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				<input type="hidden" value="A" name="answer9" />
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				<input type="radio" id="option9A" name="cQ8" value="A" />
				<label for="option9A">A.
					<pre><h2 style="font-size:20px">
		1
					</h2></pre>
				</label>
				
				<input type="radio" id="option9B" name="cQ8" value="B" />
				<label for="option9B">B.
					<pre><h2 style="font-size:20px">
		3
					</h2></pre>
				</label>

				<input type="radio" id="option9C" name="cQ8" value="C" />
				<label for="option9C">C.
					<pre><h2 style="font-size:20px">
		5
					</h2></pre>
				</label>

				<input type="radio" id="option9D" name="cQ8" value="D" />
				<label for="option9D">D.
					<pre><h2 style="font-size:20px">
		10
					</h2></pre>
				</label>
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		<div style="display:none;" id="Q10">
			<div class="question8">
				<p>10.(单选题, 4.0 分)An important principle of single inheritance is:</p>


			
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				<input type="radio" id="option10A" name="cQ9" value="A" />
				<label for="option10A">A.
					<pre><h2 style="font-size:20px">
		A class can have only one parent class					
					</h2></pre>
				</label>
				
				<input type="radio" id="option10B" name="cQ9" value="B" />
				<label for="option10B">B.
					<pre><h2 style="font-size:20px">
	    A class can have multiple parent classes
					</h2></pre>
				</label>
				
				<input type="radio" id="option10C" name="cQ9" value="C">
				<label for="option10C">C.
					<pre><h2 style="font-size:20px">
		Subclass can inherit private properties from superclass
					</h2></pre>
				</label>
				
				<input type="radio" id="option10D" name="cQ9" value="D">
				<label for="option10D">D.
					<pre><h2 style="font-size:20px">
		Interfaces also count as parent classes
					</h2></pre>
				</label>
			</div>
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